In recognition of the 200th anniversary of the Lewis and Clark expedition, David Rumsey and Telemorphic, Inc. created this mosaic of expanding geographic knowledge and development of the American West.		See the full map and learn more.

Two hundred years ago, using compass, sextant, and the help of native peoples to guide them, Meriwether Lewis and William Clark's Corps of Discovery started on a journey that would change the face of the United States and significantly impact all the peoples within.

Geographic technology today is far more advanced, and is used not just to explore but to fulfill a modern mission.

• Understand who and what is there.
• Carefully manage the use of resources.
• Plan for sustainable development.

The commemoration of the Lewis & Clark expedition offers a new chance to use geographic technology to understand change and learn how to manage change wisely.

Understanding change. This image shows changes since Lewis and Clarks' time in the Missouri River near Desoto National Wildlife Refuge north of Omaha, Nebraska. Image courtesy GCS Research LLC. Learn more.